book Maths Puzzle Numerical Ability

Jill walked at a constant rate for 2 hours and then ran twice that rate for 1/2 an hour. She traveled 18 km in all. What was her walking rate?

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5psquared - no () P=2
do you work from left to right? OR square first? HELP Let 'n' be the number of shirts produced by Company ABC, and let 'p' be the price for a shirt. From past data, these two variables are related in the following way: p= -0.003n+20.